Karma
The word [karma] penetrated the Western consciousness, from the Buddhist point of view at least, in somewhat distorted guise. It is often called the Law of Cause and Effect, so it is about the consequences and actions of the body, speech and mind. And consequences are very important in Buddhism.
Any action that is willed, however subtly, by the person who performs it will always produce a future "ripening" and ultimately a "fruit" of similar moral quality, because in the human sphere karma operates in an ethical manner. So an unethical action will produce a come-back of like kind in this life or some future rebirth; and the same goes for morally good or indifferent actions that are willed and freely undertaken. In the Bible it says something similar: that we reap what we sow. If we want to progress spiritually--or even just live with minimum aggravation--it therefore behooves us to be very careful how we speak and act, for there is no way we can escape the consequences.
- John Snelling, Elements of Buddhism
from Everyday Mind, edited by Jean Smith, a Tricycle book